Hi,
here is a nRF5340 generic usb device driver application developed with NCS 2.2.0 (Zephyr 3.2.99).
The interface has two bulk endpoint, 0x01 for RX and 0x81 for TX.
I can successfully exchange USB data between PC and the target.
I'm experiencing a problem in the PC to target direction of transfer (RX).
The RX transfer does not complete until a TX transfer gets done.
RX data is accumulated in the buffer (either in the PC or in the target), and only a TX event will unlock it.
This is the RX callback function, where I put the received data in a k_fifo before invoking a new transfer with the same cb function,
as done by ncs/zephyr/samples/subsys/usb/webusb sample code
static void usb_on_receive(uint8_t ep, int size, void *priv)
{
static uint8_t data[COSMED_BULK_EP_MPS];
struct usb_cfg_data *cfg = priv;
if (size > 0) {
struct comdrv_data_t *buf;
buf = k_malloc(sizeof(*buf));
if (buf) {
buf->len = 0;
} else {
LOG_WRN("not able to allocate buffer");
return;
}
buf->len = size;
memcpy(buf->data, &data, buf->len);
k_fifo_put(&rx_queue, buf);
}
/* start a new read transfer */
usb_transfer(hostgw.cfg->endpoint[COSMED_OUT_EP_IDX].ep_addr, data,
COSMED_BULK_EP_MPS, USB_TRANS_READ, usb_on_receive, cfg);
}
